package zuoye1;

import java.util.Scanner;

public class Demo2 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("请输入学生的成绩");
        int score = input.nextInt();

        if (score>=90&&score<=100){
            System.out.println("A");
        }else if (score>=80&&score<=90){
            System.out.println("B");
        }else if (score>=70&&score<80){
            System.out.println("C");
        }else if (score>=60&&score<70){
            System.out.println("D");
        }else if (score>=0&&score<60){
            System.out.println("E");
        }else {
            System.err.println("输入错误");
            return;
        }
    }
}
